This article is a reprint of a previously published article. For citation purposes, please use the original publication details, Fert Stert 1997;68(4):585-596. DOI of original item:https://doi.org/10.1016/S0015-0282(97)00191-X.
Disclaimer: Reprints are scanned from a print archive and any notations or underlines are the work of an early reader and do not reflect the opinions of the current authors and editors.
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